A friend had the following problem with their laptop the other day. When they open Microsoft Word they cannot select any text with the mouse, they couldn't even place the cursor into the text by clicking the mouse on the text.
She said that the situation seemed to have occured when Norton Antivirus requested an update at the same time she was doing something in Word.
I suspected that it was that Word had somehow got corrupted, so I ran a repair, by inserting her Microsoft Office DVD and bring up the installer, and selecting Repair.
This made no difference, I then reinstalled Office, still the problem persisted. This made me think that the problem was related to the Registry, so I did a Google search.
I found these articles:
To summarise the fix:
This fix involves removing the Word/Data registry key. By deleting this key you will loose some options you have set, this just means that you will need to reset them again. Additionally you will loose the list of files in your recently used files list at the bottom of the file menu.
Additionally be really careful about deleting anything out of the registry, because it can cause serious problems. All the main Windows programs use it, and you could end up reinstalling everything including your copy of Windows.
Navigate the registry and select the appropriate Word registry subkey:
Select the Data node, then from the File menu choose Export.
If the problem still persists then restore your registry back, and keep looking for a solution. To restore the registry back to normal simply: